99780000 has 120 divisors (see below), whose sum is σ = 327495168. Its totient is φ = 26592000.

The previous prime is 99779989. The next prime is 99780059. The reversal of 99780000 is 8799.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 59169 + ... + 60831.

Almost surely, 2^99780000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99780000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163747584).

99780000 is an abundant number, since it is smaller than the sum of its proper divisors (227715168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99780000 is a wasteful number, since it uses less digits than its factorization.

99780000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696 (or 1673 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 99780000 is about 9988.9939433358. The cubic root of 99780000 is about 463.8182502603.

Adding to 99780000 its reverse (8799), we get a palindrome (99788799).

The spelling of 99780000 in words is "ninety-nine million, seven hundred eighty thousand".